"We hope having two days off will help it calm down for him," Williams said. "We'll give him some treatment and some anti-inflammatories. I think he's fine. It's one of those things where you go through the season and things creep up on you, so if we can, we need to give him a day."

Werth entered into Wednesday's 6-4 loss to the Rockies during the seventh as a pinch-hitter and struck out before adding an RBI single in a two-run ninth-inning rally that fell short.

Nick Kosmider is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.